A teenage girl is selected to receive a magic talisman that allows her to receive the spirit of a great warrior and the feud associated with it.

300 years ago, legendary swordsman Yagyu Jubei led his clan of samurai triumphantly against the villainous Ryujoji clan. On his deathbed, Yagyu transfers his abilities into a heart-shaped eyepatch which he instructs his attendant, Koinosuke, to bestow upon a worthy successor. In the present day, Koinosuke (whose aging has been all but stopped) finds this successor in perky schoolgirl Nanohana Jiyu, who her father, coincidentally, has nicknamed "Jubei." Unfortunately for Koinosuke, Jiyu doesn't want to embody the spirit of Yagyu Jubei. The descendants of the Ryujoji still bear a grudge against the Yagyu, so Jiyu reluctantly accepts the eyepatch to become Yagyu Jubei and put an end to the centuries-old feud.—The Fox-2

Three hundred years ago, in the frigid land of Siberia, Jubei Yagyu engaged in a fierce battle with Kitaretsusai of the Northern Yagyu clan. The duel was costly, as his daughter Freesia was frozen in suspended animation. As a result of global warming in the present day, Freesia breaks free from her icy grave and moves to Japan as a middle school transfer student, where she befriends Jiyuu Nanohana. Little does Jiyuu know that Freesia is targeting her to acquire the coveted Lovely Eye Patch, which Freesia believes is rightfully hers.—myanimelist

Jiyu Nanohana is an ordinary schoolgirl until she runs across a scatterbrained 300 year old samurai who tells her that she is the reincarnation of Yagyu Jubei. With the help of the "Lovely Eyepatch" she transforms into the legendary swordsman whenever she needs to use his awesome fighting ability, which she needs to do quite often as a rival clan is dead set on conquering Yagyu to satisfy an old family grudge.—ANN